Stepwise reduction of bone mineral density increases the risk of cage subsidence in oblique lumbar interbody fusion patients biomechanically: an in-silico study

Yang, Zhi-Qiang; Cai, Ping; Li, Jing-Chi; Wang, Xian-Di; Xie, Tian-Hang; Pu, Xing-Xiao; Lin, Run; Zeng, Jian-Cheng; Song, Yue-Ming

doi:10.1186/s12891-022-06049-3

Table 1 Material properties of FE models’ components

From: Stepwise reduction of bone mineral density increases the risk of cage subsidence in oblique lumbar interbody fusion patients biomechanically: an in-silico study

Components	Elastic modulus (MPa)	Poisson’s ratio	Cross-section (mm²)	Mesh sizes (mm)	References
Bony structures
Cortical (Normal BMD)	E_xx = 11,300 E_yy = 11,300 E_zz = 22,000 G_xy = 3800 G_yz = 5400 G_xz = 5400	V_xy = 0.484 V_yz = 0.203 V_xz = 0.203	/	1.7	[14, 17]
Cancellous (Normal BMD)	E_xx = 140 E_yy = 140 E_zz = 200 G_xy = 48.3 G_yz = 48.3 G_xz = 48.3	V_xy = 0.45 V_yz = 0.315 V_xz = 0.315	/	2.6	[14, 17]
Bony endplates (Normal BMD)	12,000	0.3	/	1.2	[14, 17]
Cortical (Slight reduction of BMD)	Exx = 9436 Eyy = 9436 Ezz = 18,370 Gxy = 3173 Gyz = 4509 Gxz = 4509	Vxy = 0.484 Vyz = 0.203 Vxz = 0.203	/	1.7	[14, 17]
Cancellous (Slight reduction of BMD)	Exx = 93.8 Eyy = 93.8 Ezz = 150 Gxy = 32.36 Gyz = 36.23 Gxz = 36.23/	Vxy = 0.45 Vyz = 0.315 Vxz = 0.315	/	2.6	[14, 17]
Bony endplates (Slight reduction of BMD)	10,035	0.3	/	1.2	[14, 17]
Cortical (Significant reduction of BMD)	Exx = 7571 Eyy = 7571 Ezz = 14,740 Gxy = 2546 Gyz = 3618 Gxz = 3618	Vxy = 0.484 Vyz = 0.203 Vxz = 0.203		1.7	[14, 17]
Cancellous (Significant reduction of BMD)	Exx = 47.6 Eyy = 47.6 Ezz = 100 Gxy = 16.42 Gyz = 24.15 Gxz = 24.15	Vxy = 0.45 Vyz = 0.315 Vxz = 0.315	/	2.6	[14, 17]
Bony endplates (Significant reduction of BMD)	8070	0.3	/	1.2	[14, 17]
Non bony structures
Annulus	Hypoelastic material		/	2.0	[18, 26]
Nucleus	1	0.49	/	1.7	[18, 26]
Cartilages	10	0.4		0.7	[18, 26]
Ligaments
Anterior longitudinal ligaments	Calibrated load-deformation curved under different loading conditions	0.3	60	/	[16, 17]
Posterior longitudinal ligaments	Calibrated load-deformation curved under different loading conditions	0.3	21	/	[16, 17]
Ligamentum flavum	Calibrated load-deformation curved under different loading conditions	0.3	60	/	[16, 17]
Interspinous ligaments	Calibrated load-deformation curved under different loading conditions	0.3	40	/	[16, 17]
Supraspinous ligaments	Calibrated load-deformation curved under different loading conditions	0.3	30	/	[16, 17]
Intertransverse ligaments	Calibrated load-deformation curved under different loading conditions	0.3	10	/	[16, 17]
Capsular	7.5 (≤25%) 32.9 (>25%)	0.3	67.5	/	[16, 17]
Internal fixation devices
PEEK OLIF Cage	3500	0.3	/	2.0	[16, 17]
Titanium alloy screw	110,000	0.3	/	0.5	[16, 17]

Abbreviations: FE Finite element, BMD Bone mineral density, PEEK Polyetheretherketone, OLIF Oblique lumbar interbody fusion

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ISSN: 1471-2474

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